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Note: If there is no outside signal, the booster will not work for you. Does Phonetone booster work for your location? A cell phone could use different frequency band at different locations, it is very important to confirm if your cell phone works on same frequency band as the cell phone booster. To check which band your cell phone uses: For iPhone Dial *3001#12345#*, then press Call button Click 'Serving Cell Info' Check 'Freq Band Indicator'; For Android phone Download and install the app: LTE Discovery Tap 'SIGNALS' and check band number Specification: Frequency Range: Uplink 824-849MHz, Downlink 869-894MHz Max Output Power: 22dBm Max Gain: 62dB I/O Port: N-Female on both ends Main Power: AC 100~240V / DC 5V 2A Package: 1 * 850MHz Booster 1 * Power Adapter 1 * Mounting Screw Kit 1 * English User Manual 1 * 3dBi Indoor Whip Antenna 1 * 8dBi Outdoor Yagi Antenna with 10m Cable WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express consent of an FCC Licensee to operate this device. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation.